Use of the endotracheal tube introducer as an adjunct for oral tracheal intubation in the prehospital setting

Laryngeal View Classification. Grading based on laryngoscopy is as follows: Grade 1: most of glottis is visible. Grade 2: only the posterior portion of the glottis is visible. Grade 3: no portion of the glottis is visible, but epiglottis is visible. This intubation is often difficult using standard techniques. Grade 4: the epiglottis cannot be seen on laryngoscopy, and intubation is very difficult without special methods or equipment. Cormack RS, Lehane J. Difficult intubation in obstetrics, Anethesia 1984;39:1105-2001. Reprinted with permission.

Comparison of ETTI and SOTI in laryngeal view encountered using the Cormack and Lehane Grading System. Grade 1 is easiest; grade 3 and 4 are partially or completely obstructed views of the glottis. Y-axis represents absolute numbers, and X-axis is laryngeal grade encountered. Cormack RS, Lehane J. Difficult intubation in obstetrics. Anethesia 1984;39:1105-2001. Reprinted with permission.